franz-josef zilges etal



March 3, 1964 FRANZ-JOSEF zlLGEs ETAL 3,123,215

TUBE-EXTRUSION PRESSES Filed Jan. 9, 1961 5 Sheets-Sheet 1 March 3, 1964FRANZ-JOSEF zlLGEs ETAL 3,123,215

TUBE-EXTRUSION PRESSES Filed Jan. 9, 1 961 5 Sheets-Sheet 2 March 3,1964 FRANZ-JOSEF zlLGl-:s ETAL 3,123,215

TUBE-EXTRUSION PRESSES 5 Sheets-Sheet I5 Filed Jan. 9, 1961 UnitedStates Patent O 3,123,215 TUBE-EXTRUSION PRESSES Franz-Josef Zilges,Rheydt, Germany, and Gerhard Paul Krause, Pittsburgh, Pa., assignors toSehloemann Aktiengeseilschaft, Dusseldorf, Germany Filed Jan. 9, 1961,Ser. No. 81,527 Claims priority, application Germany Feb. 22, 196i) 1Claim. (Cl. 207-19).

This invention relates to an extrusion press with a mandrel and itsaccessory implements slidable in the platen of the press ram, andparticularly to a tube-extrusion press. Such tube presses have theadvantage of a platen so guided that the dimensions are extremely wellmaintained, since the platen is made very long with re- Spect to themandrel `and its driving members to be accommodated therein. The totallength of the press thus remains within moderate limits, because themandrel irnplements are arranged in the platen and not located behindthe extrusion cylinder. Since however the possibility of taking themandrel implements out of the platen in a forward or rearward directionis provided, comparatively narrow limits are set for the shortening ofthe over-all length of the press, so that the saving in overall lengthis in part lost again.

The object of this invention is to reduce the over-all length of thepress as far as possible, and nevertheless to enable the tools to beeasily dismantled. With this end in View the invention consists in themandrel implements consisting of three parts reieasable from oneanother, namely the mandrel, the mandrel-holder, and amandrel-holder-carrier sliding in the platen; that the connectionbetween the mandrel-holder and the mandrelholder-carrier is accessiblethrough a window aperture in the platen and is releasable by rotarymotions with the implements stationary, that is, not rotated; and thatthe mandrel-holder is withdrawable through the window aperture.

By the said division of the mandrel implements into three parts, and theaforementioned construction of the connecting means for the mandrelimplements, the rcsult .can be obtained that the mandrel is removablefrom the ram either in a forward direction, or, after removal of themandrel-holder through the window aperture in the platen, likewisethrough this window aperture.

The invention further relates to the special construction of theconnecting means, which, on the lines mentioned above, are easilyreleasable, with a saving of space.

The invention is illustrated by way of example in the accompanyingdrawings, in which:

FIGURE la shows the arrangement, as a whole, of part of a pressaccording to the invention, in side elevation, partly in section;

lFIGURE 1b shows another part of the press, also in side elevation andpartly in section;

FIGURE 2 is a rear View, partly in section on the line II-II in FIGUREl;

FIGURE 3 is a side view of part of the press shown in FIGURE la, on alarger scale, and partly in section;

FIGURE 4 shows one form of connecting means in longitudinal section; and

FIGURE 5 sho-ws another form of connecting means, likewise inlongitudinal section.

The press comprises a bolster 1 and a die-holder 1a. Against the latteris impelled a container 2, with a container-holder 3. Thecontainer-holder 3 runs with claws upon a guideway 4, and is rigidlyconnected by means of rods 5 with a ring-traverse 6, which in its turnruns on guideways 7, and is connected, by way of rods not shown, withpistons, which slide in lateral cylinders l9a. The main extrusioncylinder 8 is carried by a cylinder cross-bar 9, and actuates anelongated platen 10, which is likewise slidable on the guideways 4. Theplaten 10 is withdrawable with the aid of retracting pistons which runin cylinders 11. It has window apertures 12 on both sides, through whichthe mandrel implements are accessible. The mandrel 13 is longitudinallyslidable in the press ram 14, which is ixedly mounted on the platen 10.

The mandrel 13 is connected with the mandrel-holder 16 by way of aconnecting means, namely a bayonet joint 15. This mandrel-holder is inits turn connected with the mandrel-holder-carrier 1,8 by way of anotherconnecting means 17. The mandrel-holdercarrier is supported in a mandrelcross-bar which runs upon guide rails 19, which are arranged in theplaten 10. The connecting means 17 that connects the mandrel-holder 16With the mandrel-holder-carrier 18 is so arranged in relation to thewindow aperture 12 that it is accessible through this aperture. Theconnecting means 15 is accessible from the end face of the ram 14 whenthe mandrel 13 is moved outwards. The `connecting means 15 and 17 arehere so constructed that they can be released by rotary movements, whilethe tools 13, 16 and 118 are secured against rotation. The mandrel 13can be slid forward out of the ram 14, or, after the mandrel-holder 16has been dismantled, can be taken out through the Window aperture 12.The mandrel-holder 116 is taken out of the aperture 12 after the releaseof the connecting means 15 and 17.

The connecting means 17 is illustrated on a larger scale in FIGURE 4. Itcomprises two half-shells or halfsleeves, one of which, namely 2d, isvisible in FIGURE 4. This half-shell has two anges 2da, with bores 21for the passage of screws, which hold the halfeshells together. Theright-hand ends of the half-shells have a right-handed screw thread 22,while the left-hand ends have a left-handed thread 23. The right-handend of the mandrel-holder 16 has a thread that corresponds to the thread23, While a spigot 24 of the mandrel-holder-carrier 18 is provided witha thread that corresponds to the thread 22. The spigot 24 and the end ofthe mandrelholder 16 are kept co-axial with one another by means of acentering spigot 25. The half-shells 20 have in the middle a weakening26, which serves as a pre-set breaking point. In the event therefore ofthe mandrel appliance being subjected to an excessive stress, the shellsbreak in the region of the weakening 26, so that the actual piercingtools 13, 16 and 18 remain unharmed.

For the release of the connecting means 17, the screws passing throughthe screw holes 21 are released. The half-shells Ztl can then be takenapart. For the re-establishment of the connection they are remounted,and the screw bolts are passed through the holes Z1 and tightened up. Ifthe half-shells 2t? are now rotated about their longitudinal axis with asuitable implement, they press the end faces of the spigot 24 and themandrelholder 16 against one another, so that a firm connection isestablished.

Instead of the connecting means shown in FIGURE 4, a bayonet joint as inFlGURE 5 may be selected. Here the mandrel-holder-carrier 13 carries apressure plate 27, against which the mandrel-holder 16a bears with itscollar 23. In the periphery of the collar 28 are machined four or sixbayonet teeth 29, which are slidable through corresponding longitudinalslots 36 in a sleeve 31. After the mandrel-holder 16a has been slippedin, and the sleeve 31 has been turned, the surfaces 32 of the teeth 29bear against corresponding end faces of the sleeve 31. The sleeve 31 isconnected rotationally fast by a key 33 with an actuating ring 34, onwhich a Spanner or the like can be set. The bayonet-joint sleeve 31 hasan annular abutment 35, upon which presses a screw-threaded muff 36,which is screwed into the mandrel-holder-carrier 18. When the threadedmuil 36 is tightened, the bayonet joint cannot be released. After thethreaded mui 36 is loosened, however, the bayonet-joint sleeve can beturned through 45 or 30, according to whether it has four teeth or siX,and the teeth 2.9 then slip through the slots 30, when themandrel-holder 16a is drawn towards the left out of themandrel-holder-carrier 18.

What we claim is:

A tube extrusion press comprising a press ram, a platen xed on said ram,a mandrel slidable in said platen, a mandrel holder slidable in saidplaten, a mandrel holder carrier slidable in said platen, meansreleasably connecting said mandrel and said mandrel holder, an axial re-.cess in said mandrel holder carrier, said recess having an internallythreaded side wall and an end wall, a mul threadedly received in saidrecess, a sleeve rotatably received in said muil", cooperating shoulderson said muti and slee-1e to prevent relative axial movement of saidsleeve in said muil outwardly of said recess, an internal annular recessin the inner end of said sleeve providing an abutment, a plurality ofcircumferentially spaced internal longitudinal grooves in said sleevecommunicating with said annular recess, a collar on said mandrel holder,circumferentially spaced radially projecting teeth on said collar, saidteeth being slidable through said grooves to dispose said collar in saidannular recess, rotation of said sleeve with respect to said collarserving to engage said teeth with said abutment to provide a bayonetjoint between said mandrel holder and said mandrel holder carrier,rotation of said muf serving to clamp said collar in engagement with theend wall of said first-mentioned recess thereby providing releasablemeans connecting said mandrel holder and said mandrel holder carrier,and said platen having a window aperture therein to facilitatemanipulation of the means connecting said mandrel and said mandrelholder and the means connecting said mandrel holder and said mandrelholder carrier, the length of said window aperture being substantiallyequal to the length of said mandrel holder plus the length of the meansconnecting said mandrel holder and said mandrel holder carrier and saidwindow aperture being so located as to permit insertion and removal ofsaid mandrel and said mandrel holder when separated.

Referenees Cited in the le of this patent UNITED STATES PATENTS 528,167Jones Oct. 30, 1894 1,019,657 Kerr Mar. 5, 1912 1,131,399 McGinby Mar.9, 11915 1,134,179 Boyd Apr. 6, 19115 1,286,726 :Noble Dec. 3, 19181,392,363 Shannon Oct. 4, 1921 2,085,074 Boyles Q June 29, 19372,472,586 Harvey June 7, 1949 2,696,397 Booth Dec. 7, 1954 2,698,683Martin J an. 4, 1955 2,732,066 Albers Jan. 24, 1956 2,859,870 Hitz Nov.11, 1958 2,903,130 Reichl Sept. 8, 1959 FOREIGN PATENTS 1,048,855Germany Ian. 22, 1959

